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Flat tops in the output signal is due to ___________

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Flat tops in the output signal is due to ___________

(a) Frequency distortion

(b) Amplitude distortion

(c) Phase distortion

(d) Harmonic distortion

I had been asked this question during an interview for a job.

My question comes from Distortion in Amplifier-1 topic in section Power Amplifier of Analog Circuits

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Right option is (b) Amplitude distortion

The explanation is: If amplifier output is beyond maximum value it cannot display voltage further than maximum value. This constitute clipping and creates flat tops in the output wave. This is due to amplitude distortion in the amplifier.

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